Collapsing tap



' A. F.'BREITENSTEIN COLLAPSING TAP Filed Fab- 9, 1924 2 Shuts-Shut 1Patented Nov. 10, 1925.

UNITED STATES PATENT QFFICE.

ALBERT E. BEEITENsTE'I oE NEw HAVEN, CONNE TICUT, AssIGNoE To THE GEO-METRIC T001. 00., OF NEW HAVEN, CONNECTICUT.

CoLLArsING TAP.

Application filed February 9, 1924. Serial No. 691,584.

T o all whom it may concern: I

' Be it known that I, ALBERT F. BREITEN- sTEIN, a citizen of the UnitedStates, residing at New Haven, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in CollapsingTaps; and I do hereby declare the following, when taken in connectionwith the accompanying drawings and the characters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this application, and representin Fig. 1 a view in side elevation of one form which a tap'constructedinaccordance with my invention may assume, shown as collap ed.

Fig. 2 a view thereof in central longitudinal section, shown as set.

' Fig. 3 a transverse sectional view of the tap on the line 3-3 of Fig.2.

Fig. 4 a detachedperspective view of the detent-carrying ring.

Fig. 5 a similar view of the detent.

Fig. 6 a view corresponding to Fig. but showing a modified form ofdetent.

My invention relates to an improved collapsing tap,-the object being toprovide, at a low cost for manufacture, a compact, convenient andreliable tap, constructed with particular reference to ruggedness ofconstruction and durability in use.

With these ends in view, my invention consists in a collapsing taphaving' a segmental detent arranged at a right angle to the longitudinalaxis of the tap and released by th linear movement of a member of thetap, prior to collapsing the same. 7

My invention further consists 111 a collapsing tap having certaindetails of construction as will be hereinafter described and pointed outin the claims.

In carrying out my invention, as herein shown, I employ a tap-bodylOhaving an integral shank 11, by meansof which the tap is mounted foruse. The said tap-body mounts a detent-carrying ring 12 which has linearsliding movement upon it and which, in turn, mounts an operating-sleeve13, which has linear sliding movement upon it. 'At its rear end thetap-body is formed with a threaded shoulder 14 for the reception of aninternally-threaded detent-abutment ring 15 having an inte ral,forwardly-projecting,

r annular flange 13 entering an annular space "axis of the tap andthereto located within a transverse slot 20 formed toward the inner endof the detent-carrying ring 12, when the said detent has been movedradially'outward in the slot by springs 21 acting upon plungers 22engaging, as clearly shown in Fig. 3, with the bottom of the said slot,the said springs and plungers being located in holes 23 in the ends ofthe detent. The forward edge of the detent is formed with a bevel 24;for co-action with the annular cam 18 at the bottom of the space 17 inthe operatingsleeve 13, v so that,'when the sleeve is moved rearward,its cam 18 co-acts with the level 24 ofthe detent to crowd the sameinwand against the tension of the springs 21, so as to disengage theouter edge of its rear face from the edge of the flange 16 of thedetent-abutment ring 15.

The detent-c arrying ring 12 is coupled to the plunger 25 by means of atransverselyarranged coupling-bar 26 passing through a diametric slot 27in the plunger and through a diametric clearance-slot 28 in thetap-body, its ends being entered into slots 29 in the ring itself, asshown in Fig. 3, whereby the said ring moves the said plunger when thetap is set, and the plunger moves the ring when the tap is trippedgtheclearance-slot 28 in the tap-body being long enough to permit the ringand plunger to have sufficient conjointmovement to permit the collapsingand resetting of the tap.

At its rear end the plunger has screwed into it the inner end of aplunger-screw 30, mainly located in a bore 31 in the shank 11 of thebody. The said screw carries a helical tap-collapsing spring 32 1interposed between its head 33 and a washer 34L abutted against ashoulder 35 produced at the inner end of the bore 31 by making the samelarger than the bore 36 formed in thetapcut inclined ribs ell formedintegral with the forward end of the plunger 25.

At is forward end, the detent-carrying ring 12 is formed with an annularflange L2, which co-acts with the forward end of the operating-sleeve13. as will hereinafter appear.

The ope 'ation 01'' my improved tap is as follows:

As shown in Fig. 2, the chasers of the tap are in their projected orcutting positions, in which they are lirmly held against the tension ofthe collapsing-spring 3:2 by the engagement of the outer edge of theinner face of the detent 1%) with the edge of the annular flange 16 ofthe detent-abutnlent ring 15, the detent being at this time held in itsoperating position by its springs 21, its outer t'aee being, at thistime. projected beyond the periphery of the detent-carryine 17111;; 12.Now, assun'iing that the cutters have performed their work and it is dsired to withdraw them therefrom, the annular flange 4-3 of theoperatingsleeve is engaged by a suitable abutment (not shown) of themachine in which the tap is being used, whereby the sleeve is movedrearward with reference to the tap toward the position in which it isshown by broken lines in Fig); 2. This rearward movement ot the sleeveaway from the flange 49. ot the ring; causes the cam 18 of the sleeve toact upon the bevel 2st of the segmental detent which is thus crowdedradially inward into its slot against the tension oi the springs 21,until it is brought down flush with the periphery of the ring 12 atwhich time it is disengaged from the flange 16 of the detent-abutmentring 15 whereby the spring is permitted to pull the plunger rearward andthus positively retract the chasers :38 into their collapsed orclearance positions, as shown in Fig. 1, in which they clear the work.

Through the medium of the couplingbar 26, the detent-carrying ring 12 isretracted with the plunger whereby the detent 1O carried within the:torwardly-projecting flange 16 of the ring 1:), where it remains untilthe tap is reset by pushing forward on the flange at?) of theoperating-sleeve 13, the forward edge of which engages with the flange4:52 of the ring 12-. which then moves forward with respect to thetap-body 1.0. As the ring 12 moves Il'iOLWVtLlCLdh correspondingly movesthe plunger 25 through the medium of the coupling-bar 26 whereby thespring 32 is compressed and the chasers projected. At the limit of thisforward movement just described, the segmental detent 19 cscapes as itwere, from its conlinement within theannular flange 16 of the ring 15and snaps into engagement with the edge thereof, as shown in Fig. The

detentnow acts to hold. the chascrs in their projected or cuttingpositions until the tap is again tripped by the co-action of the flangeof the sleeve 13 with a suitablyplaced abutment oi the machine. It maybe stated here that the means for operating the sleeve 13 for collapsinpand resetting the tap has nothing to do wlth my present invention. Ihave shown a rotary tap, but the invention is equally applicable to atap adapted to have its ope sting-sleeve engaged for manual operation.

In the inodilied construction shown by hip. (3 the segmental detent4-4;, instead 01 moving bodily outward in a transverse slot in thedetenocarrying ring, has one end pivoted therein upon a pivot lf) whileits opposite end is provided with a springplunger l d. This pivotalsegmental detent it operates, to all intents and purposes, in the samemanner as the radially-movable, segnnent-al detent 19 already described,the amental detent in either case moving in a plane transverse to theflXlSOfE the tap.

I claim:

1. In a collapsing tap the combination with the body, chaser-s, plungerand col-lapsing-spring thereof; of a ring having sliding movement uponthe said body and formed with a transverse slot, a segmental detentlocated in the said transverse slot andhavinn n'iovement therein in aplane transverse to the axis of the tap, an operating-sleeve havingsliding movement upon the said ring and co-acting with the said detentto force the same into its retired position in the said slot, and adetent-alnitment ring havin an annular flange entering the said sleeveinto position to cont-t with the said detent when in its operatingposition for holding the cuttors in their projected positions andagainst the power cl the said spring.

2. In a collapsing tap, the cmnbinatimi with the body, ehasers plm'igerand collaps inn-spring thereof; of a ring having sliding movement uponthe said body and formed with a transverse slot, a segmental detentlocated in the said slot a spring for operating the said detent. anoperating-sleeve hav' ing sliding movement upon the said ring andco-aetino with the forward edge of the said detent 'torretiring the sameagainst the action of its spring, and a detent-abutment ring mountedupon the tap-body, entering the rear end of the said sleeve and engagingwith the outer edge of the rear Face ot t'he detent to hold the plungerin its forward position against the power of the collapsing spring.

In testimony whereof, I have signed this specification.

ALBERT r. nnnrrnnsrnm.

